Quebec City, April 21, 2009—Researchers at Université Laval's Faculty of Medicine have found that people who sleep too much or not enough are at greater risk of developing type 2 diabetes or impaired glucose tolerance. The risk is 2˝ times higher for people who sleep less than 7 hours or more than 8 hours a night. The findings were published recently on the website of the journal Sleep Medicine.
The researchers arrived at this conclusion after analyzing the life habits of 276 subjects over a 6-year period. They determined that over this timespan, approximately 20% of those with long and short sleep duration developed type 2 diabetes or impaired glucose tolerance versus only 7% among subjects who were average duration sleepers. Even after taking into account the effect attributable to differences in body mass among the subjects, the risk of diabetes and insulin resistance was still twice as high among those with longer and shorter sleep duration than average sleepers.
Sleep amount correlates with the incidence of many diseases.
The researchers also point out that diabetes is not the only risk associated with sleep duration. A growing number of studies have shed light on a similar relationship between sleep and obesity, cardiovascular disease, and overall mortality. The authors observe that among adults, between 7 and 8 hours of nighttime sleep appears to be the optimum duration to protect against common diseases and premature death.
Modern life is cutting in to the hours people sleep.
However, it seems that fewer and fewer people sleep the optimum number of hours. A survey conducted in 1960 showed that American adults slept an average of 8 to 8.9 hours a night. By 1995, that average had dropped to 7 hours. A study conducted in 2004 by the National Center for Health Statistics found that one-third of adults aged 30 to 64 slept less than 6 hours a night.
Are you getting enough sleep? Anyone get too much? If I was following the lesson of this report I wouldn't be up so late writing blog posts.
|Share |||Randall Parker, 2009 April 21 11:51 PM Aging Lifestyle Studies|